text: On May 15, he began to show symptoms of lethargy, fatigue, sore throat (not coughing), loss of taste and went to get samples for testing, the result was negative?
classes:  No, on May 15, he was tested and the result was positive.  Also, on May 15, he was tested and the result was positive.  Yes, on May 15, he was tested and the result was positive.